Resuspended sediment exchange between the north and south Yellow Sea in the north of Chengshantou

Abstract

Due to the regional differences between the North and South Yellow Sea, and under the influence of winter winds, the relative changes of the coastal current and the Yellow Sea warm current will lead to the instability of the front, which will lead to the cross-front transport of sediment. Therefore, the study of sediment exchange between the North and South Yellow Sea has become an indispensable part of the study of the Yellow Sea environment. In this paper, the current field and sediment concentration in the sorthern part of Chengshantou, a representative area of the Yellow Sea, were observed in winter in order to analyze the sediment exchange process between the North Yellow Sea and the South Yellow Sea in winter. The results show that in the north of Chengshantou sea area in winter, the current velocity does not change with the water depth when the water depth is more than 20 m, and the variation range is less than 5 cm/s, and the tides are regular semi-diurnal tides. The resuspension of sediments in the sea area is not controlled by the current velocity, but the sediment transport per unit width is mainly affected by the current velocity. Under the Shandong peninsula coastal current effect, suspended sediment is mainly transported from the north Yellow Sea to the South Yellow Sea, and the total difference between the southward and northward sediment is 442500 NTU×m2 during the observation period of about one month. The largest two-day transport volume accounted for 41.2% of the total transport flux.